diff --git a/tests/baselines/reference/api/tsserverlibrary.d.ts b/tests/baselines/reference/api/tsserverlibrary.d.ts
index ee13a377f5e..8f2f0c8cbbd 100644
--- a/tests/baselines/reference/api/tsserverlibrary.d.ts
+++ b/tests/baselines/reference/api/tsserverlibrary.d.ts
@@ -8346,7 +8346,7 @@ declare namespace ts.server {
         excludedFiles: ReadonlyArray<NormalizedPath>;
         private typeAcquisition;
         updateGraph(): boolean;
-        getExcludedFiles(): readonly NormalizedPath[];
+        getExcludedFiles(): ReadonlyArray<NormalizedPath>;
         getTypeAcquisition(): TypeAcquisition;
         setTypeAcquisition(newTypeAcquisition: TypeAcquisition): void;
     }